Investigation of gas hydrate phase equilibria in bulk and in a large particle size natural quartz sand for methane, carbon dioxide and natural gas

• Published in: Petroleum science and technology Vol. 42; no. 22; pp. 3225 - 3242
• Main Authors: Cruz-Castro, Lucila, Ramirez-Jaramillo, Edgar, Albiter-Hernández, Apolinar
• Format: Journal Article
• Language: English
• Published: Abingdon Taylor & Francis 16.11.2024; Taylor & Francis Ltd
• Subjects: Carbon dioxide; Equilibrium; equilibrium cell; Equilibrium conditions; equilibrium points; Gas formation; Gas hydrates; Heating rate; Methane; Natural gas; Particle size; Phase equilibria; Porous media; Quartz; Sand
• ISSN: 1091-6466; 1532-2459
• DOI: 10.1080/10916466.2023.2192243

In the present work, a comparison of the P-T equilibrium points of gas hydrates formation in bulk phase and porous medium (large particle size natural quartz sand) was studied for three different gas-hydrates: CO 2 , CH 4 and a sample of natural gas. The effect of the large particle size in the P-T equilibrium conditions during the formation of gas hydrates was analyzed. Isochoric method and a cooling-heating rate of 0.7 K/h were used. The experimental results are compared with literature data and with the software CSMHyd and PVTsim. It was found that the P-T equilibrium points obtained in bulk are similar, within the experimental error, to the P-T points obtained in the large particle size natural quartz sand (gas + water + porous medium), in the range of temperature and pressure of 270-285 K and 1-14 MPa. For the systems gas (CO 2 , CH 4 ) + water, the results were compared with literature data with an average deviation less than 7%. The system natural gas + water + porous medium was compared with similar experiments reported in the literature with smaller porous size silica (6-100 nm). A similar tendency is observed in systems with a porous size greater than 20 nm. Porosity and permeability of quartz sand were measured experimentally. Phase equilibria of CH 4 , CO 2 , and natural gas hydrates in quartz sand were measured. The methodology is validated for gas hydrates stability in bulk phase and porous media. Experimental results are compared with literature and software CSMHyd and PVTsim.